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NetBSD/bin/csh/csh.c

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/* $NetBSD: csh.c,v 1.26 2000/09/04 17:48:14 christos Exp $ */
/*-
* Copyright (c) 1980, 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1980, 1991, 1993\n\
The Regents of the University of California. All rights reserved.\n");
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)csh.c 8.2 (Berkeley) 10/12/93";
#else
__RCSID("$NetBSD: csh.c,v 1.26 2000/09/04 17:48:14 christos Exp $");
#endif
#endif /* not lint */
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <pwd.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <locale.h>
#include <unistd.h>
#include <vis.h>
#include <paths.h> /* should this be included in pathnames.h instead? */
#if __STDC__
# include <stdarg.h>
#else
# include <varargs.h>
#endif
#include "csh.h"
#include "proc.h"
#include "extern.h"
#include "pathnames.h"
/*
* C Shell
*
* Bill Joy, UC Berkeley, California, USA
* October 1978, May 1980
*
* Jim Kulp, IIASA, Laxenburg, Austria
* April 1980
*
* Christos Zoulas, Cornell University
* June, 1991
*/
Char *dumphist[] = {STRhistory, STRmh, 0, 0};
Char *loadhist[] = {STRsource, STRmh, STRtildothist, 0};
int nofile = 0;
bool reenter = 0;
bool nverbose = 0;
bool nexececho = 0;
bool quitit = 0;
bool fast = 0;
bool batch = 0;
bool mflag = 0;
bool prompt = 1;
bool enterhist = 0;
extern char **environ;
static int readf __P((void *, char *, int));
static fpos_t seekf __P((void *, fpos_t, int));
static int writef __P((void *, const char *, int));
static int closef __P((void *));
static int srccat __P((Char *, Char *));
static int srcfile __P((char *, bool, bool));
static void phup __P((int));
static void srcunit __P((int, bool, bool));
static void mailchk __P((void));
#ifndef _PATH_DEFPATH
static Char **defaultpath __P((void));
#endif
int main __P((int, char **));
int
main(argc, argv)
int argc;
char **argv;
{
Char *cp;
char *tcp;
const char *ecp;
int f;
char **tempv;
struct sigaction oact;
sigset_t sigset;
cshin = stdin;
cshout = stdout;
csherr = stderr;
settimes(); /* Immed. estab. timing base */
/*
* Initialize non constant strings
*/
#ifdef _PATH_BSHELL
STR_BSHELL = SAVE(_PATH_BSHELL);
#endif
#ifdef _PATH_CSHELL
STR_SHELLPATH = SAVE(_PATH_CSHELL);
#endif
STR_environ = blk2short(environ);
environ = short2blk(STR_environ); /* So that we can free it */
STR_WORD_CHARS = SAVE(WORD_CHARS);
HIST = '!';
HISTSUB = '^';
word_chars = STR_WORD_CHARS;
tempv = argv;
if (eq(str2short(tempv[0]), STRaout)) /* A.out's are quittable */
quitit = 1;
uid = getuid();
gid = getgid();
euid = geteuid();
egid = getegid();
/*
* We are a login shell if: 1. we were invoked as -<something> and we had
* no arguments 2. or we were invoked only with the -l flag
*/
loginsh = (**tempv == '-' && argc == 1) ||
(argc == 2 && tempv[1][0] == '-' && tempv[1][1] == 'l' &&
tempv[1][2] == '\0');
if (loginsh && **tempv != '-') {
/*
* Mangle the argv space
*/
tempv[1][0] = '\0';
tempv[1][1] = '\0';
tempv[1] = NULL;
for (tcp = *tempv; *tcp++;)
continue;
for (tcp--; tcp >= *tempv; tcp--)
tcp[1] = tcp[0];
*++tcp = '-';
argc--;
}
if (loginsh)
(void) time(&chktim);
AsciiOnly = 1;
#ifdef NLS
(void) setlocale(LC_ALL, "");
{
int k;
for (k = 0200; k <= 0377 && !Isprint(k); k++)
continue;
AsciiOnly = k > 0377;
}
#else
AsciiOnly = getenv("LANG") == NULL && getenv("LC_CTYPE") == NULL;
#endif /* NLS */
/*
* Move the descriptors to safe places. The variable didfds is 0 while we
* have only FSH* to work with. When didfds is true, we have 0,1,2 and
* prefer to use these.
*/
initdesc();
/*
* XXX: This is to keep programs that use stdio happy.
* what we really want is freunopen() ....
* Closing cshin cshout and csherr (which are really stdin stdout
* and stderr at this point and then reopening them in the same order
* gives us again stdin == cshin stdout == cshout and stderr == csherr.
* If that was not the case builtins like printf that use stdio
* would break. But in any case we could fix that with memcpy and
* a bit of pointer manipulation...
* Fortunately this is not needed under the current implementation
* of stdio.
*/
(void) fclose(cshin);
(void) fclose(cshout);
(void) fclose(csherr);
if (!(cshin = funopen((void *) &SHIN, readf, writef, seekf, closef)))
exit(1);
if (!(cshout = funopen((void *) &SHOUT, readf, writef, seekf, closef)))
exit(1);
if (!(csherr = funopen((void *) &SHERR, readf, writef, seekf, closef)))
exit(1);
(void) setvbuf(cshin, NULL, _IOLBF, 0);
(void) setvbuf(cshout, NULL, _IOLBF, 0);
(void) setvbuf(csherr, NULL, _IOLBF, 0);
/*
* Initialize the shell variables. ARGV and PROMPT are initialized later.
* STATUS is also munged in several places. CHILD is munged when
* forking/waiting
*/
set(STRstatus, Strsave(STR0));
if ((ecp = getenv("HOME")) != NULL)
cp = quote(SAVE(ecp));
else
cp = NULL;
if (cp == NULL)
fast = 1; /* No home -> can't read scripts */
else
set(STRhome, cp);
dinit(cp); /* dinit thinks that HOME == cwd in a login
* shell */
/*
* Grab other useful things from the environment. Should we grab
* everything??
*/
if ((ecp = getenv("LOGNAME")) != NULL ||
(ecp = getenv("USER")) != NULL)
set(STRuser, quote(SAVE(ecp)));
if ((ecp = getenv("TERM")) != NULL)
set(STRterm, quote(SAVE(ecp)));
/*
* Re-initialize path if set in environment
*/
if ((ecp = getenv("PATH")) == NULL) {
#ifdef _PATH_DEFPATH
importpath(str2short(_PATH_DEFPATH));
#else
setq(STRpath, defaultpath(), &shvhed);
#endif
} else {
importpath(str2short(ecp));
}
set(STRshell, Strsave(STR_SHELLPATH));
doldol = putn((int) getpid()); /* For $$ */
shtemp = Strspl(STRtmpsh, doldol); /* For << */
/*
* Record the interrupt states from the parent process. If the parent is
* non-interruptible our hand must be forced or we (and our children) won't
* be either. Our children inherit termination from our parent. We catch it
* only if we are the login shell.
*/
/* parents interruptibility */
(void) sigaction(SIGINT, NULL, &oact);
parintr = oact.sa_handler;
(void) sigaction(SIGTERM, NULL, &oact);
parterm = oact.sa_handler;
/* catch these all, login shell or not */
(void) signal(SIGHUP, phup); /* exit processing on HUP */
(void) signal(SIGXCPU, phup); /* ...and on XCPU */
(void) signal(SIGXFSZ, phup); /* ...and on XFSZ */
/*
* Process the arguments.
*
* Note that processing of -v/-x is actually delayed till after script
* processing.
*
* We set the first character of our name to be '-' if we are a shell
* running interruptible commands. Many programs which examine ps'es
* use this to filter such shells out.
*/
argc--, tempv++;
while (argc > 0 && (tcp = tempv[0])[0] == '-' && *++tcp != '\0' && !batch) {
do
switch (*tcp++) {
case 0: /* - Interruptible, no prompt */
prompt = 0;
setintr = 1;
nofile = 1;
break;
case 'b': /* -b Next arg is input file */
batch = 1;
break;
case 'c': /* -c Command input from arg */
if (argc == 1)
xexit(0);
argc--, tempv++;
arginp = SAVE(tempv[0]);
prompt = 0;
nofile = 1;
break;
case 'e': /* -e Exit on any error */
exiterr = 1;
break;
case 'f': /* -f Fast start */
fast = 1;
break;
case 'i': /* -i Interactive, even if !intty */
intact = 1;
nofile = 1;
break;
case 'm': /* -m read .cshrc (from su) */
mflag = 1;
break;
case 'n': /* -n Don't execute */
noexec = 1;
break;
case 'q': /* -q (Undoc'd) ... die on quit */
quitit = 1;
break;
case 's': /* -s Read from std input */
nofile = 1;
break;
case 't': /* -t Read one line from input */
onelflg = 2;
prompt = 0;
nofile = 1;
break;
case 'v': /* -v Echo hist expanded input */
nverbose = 1; /* ... later */
break;
case 'x': /* -x Echo just before execution */
nexececho = 1; /* ... later */
break;
case 'V': /* -V Echo hist expanded input */
setNS(STRverbose); /* NOW! */
break;
case 'X': /* -X Echo just before execution */
setNS(STRecho); /* NOW! */
break;
} while (*tcp);
tempv++, argc--;
}
if (quitit) /* With all due haste, for debugging */
(void) signal(SIGQUIT, SIG_DFL);
/*
* Unless prevented by -, -c, -i, -s, or -t, if there are remaining
* arguments the first of them is the name of a shell file from which to
* read commands.
*/
if (nofile == 0 && argc > 0) {
nofile = open(tempv[0], O_RDONLY);
if (nofile < 0) {
child = 1; /* So this doesn't return */
stderror(ERR_SYSTEM, tempv[0], strerror(errno));
}
ffile = SAVE(tempv[0]);
/*
* Replace FSHIN. Handle /dev/std{in,out,err} specially
* since once they are closed we cannot open them again.
* In that case we use our own saved descriptors
*/
if ((SHIN = dmove(nofile, FSHIN)) < 0)
switch(nofile) {
case 0:
SHIN = FSHIN;
break;
case 1:
SHIN = FSHOUT;
break;
case 2:
SHIN = FSHERR;
break;
default:
stderror(ERR_SYSTEM, tempv[0], strerror(errno));
/* NOTREACHED */
}
(void) ioctl(SHIN, FIOCLEX, NULL);
prompt = 0;
/* argc not used any more */ tempv++;
}
intty = isatty(SHIN);
intty |= intact;
if (intty || (intact && isatty(SHOUT))) {
if (!batch && (uid != euid || gid != egid)) {
errno = EACCES;
child = 1; /* So this doesn't return */
stderror(ERR_SYSTEM, "csh", strerror(errno));
}
}
/*
* Decide whether we should play with signals or not. If we are explicitly
* told (via -i, or -) or we are a login shell (arg0 starts with -) or the
* input and output are both the ttys("csh", or "csh</dev/ttyx>/dev/ttyx")
* Note that in only the login shell is it likely that parent may have set
* signals to be ignored
*/
if (loginsh || intact || (intty && isatty(SHOUT)))
setintr = 1;
settell();
/*
* Save the remaining arguments in argv.
*/
setq(STRargv, blk2short(tempv), &shvhed);
/*
* Set up the prompt.
*/
if (prompt) {
set(STRprompt, Strsave(uid == 0 ? STRsymhash : STRsymcent));
/* that's a meta-questionmark */
set(STRprompt2, Strsave(STRmquestion));
}
/*
* If we are an interactive shell, then start fiddling with the signals;
* this is a tricky game.
*/
shpgrp = getpgrp();
opgrp = tpgrp = -1;
if (setintr) {
**argv = '-';
if (!quitit) /* Wary! */
(void) signal(SIGQUIT, SIG_IGN);
(void) signal(SIGINT, pintr);
sigemptyset(&sigset);
(void) sigaddset(&sigset, SIGINT);
(void) sigprocmask(SIG_BLOCK, &sigset, NULL);
(void) signal(SIGTERM, SIG_IGN);
if (quitit == 0 && arginp == 0) {
(void) signal(SIGTSTP, SIG_IGN);
(void) signal(SIGTTIN, SIG_IGN);
(void) signal(SIGTTOU, SIG_IGN);
/*
* Wait till in foreground, in case someone stupidly runs csh &
* dont want to try to grab away the tty.
*/
if (isatty(FSHERR))
f = FSHERR;
else if (isatty(FSHOUT))
f = FSHOUT;
else if (isatty(OLDSTD))
f = OLDSTD;
else
f = -1;
retry:
if ((tpgrp = tcgetpgrp(f)) != -1) {
if (tpgrp != shpgrp) {
sig_t old = signal(SIGTTIN, SIG_DFL);
(void) kill(0, SIGTTIN);
(void) signal(SIGTTIN, old);
goto retry;
}
opgrp = shpgrp;
shpgrp = getpid();
tpgrp = shpgrp;
/*
* Setpgid will fail if we are a session leader and
* mypid == mypgrp (POSIX 4.3.3)
*/
if (opgrp != shpgrp)
if (setpgid(0, shpgrp) == -1)
goto notty;
/*
* We do that after we set our process group, to make sure
* that the process group belongs to a process in the same
* session as the tty (our process and our group) (POSIX 7.2.4)
*/
if (tcsetpgrp(f, shpgrp) == -1)
goto notty;
(void) ioctl(dcopy(f, FSHTTY), FIOCLEX, NULL);
}
if (tpgrp == -1) {
notty:
(void) fprintf(csherr, "Warning: no access to tty (%s).\n",
strerror(errno));
(void) fprintf(csherr, "Thus no job control in this shell.\n");
}
}
}
if ((setintr == 0) && (parintr == SIG_DFL))
setintr = 1;
(void) signal(SIGCHLD, pchild); /* while signals not ready */
/*
* Set an exit here in case of an interrupt or error reading the shell
* start-up scripts.
*/
reenter = setexit(); /* PWP */
haderr = 0; /* In case second time through */
if (!fast && reenter == 0) {
/* Will have value(STRhome) here because set fast if don't */
{
int osetintr = setintr;
sig_t oparintr = parintr;
sigset_t osigset;
sigemptyset(&sigset);
(void) sigaddset(&sigset, SIGINT);
(void) sigprocmask(SIG_BLOCK, &sigset, &osigset);
setintr = 0;
parintr = SIG_IGN; /* Disable onintr */
#ifdef _PATH_DOTCSHRC
(void) srcfile(_PATH_DOTCSHRC, 0, 0);
#endif
if (!fast && !arginp && !onelflg)
dohash(NULL, NULL);
#ifdef _PATH_DOTLOGIN
if (loginsh)
(void) srcfile(_PATH_DOTLOGIN, 0, 0);
#endif
(void) sigprocmask(SIG_SETMASK, &osigset, NULL);
setintr = osetintr;
parintr = oparintr;
}
(void) srccat(value(STRhome), STRsldotcshrc);
if (!fast && !arginp && !onelflg && !havhash)
dohash(NULL, NULL);
/*
* Source history before .login so that it is available in .login
*/
if ((cp = value(STRhistfile)) != STRNULL)
loadhist[2] = cp;
dosource(loadhist, NULL);
if (loginsh)
(void) srccat(value(STRhome), STRsldotlogin);
}
/*
* Now are ready for the -v and -x flags
*/
if (nverbose)
setNS(STRverbose);
if (nexececho)
setNS(STRecho);
/*
* All the rest of the world is inside this call. The argument to process
* indicates whether it should catch "error unwinds". Thus if we are a
* interactive shell our call here will never return by being blown past on
* an error.
*/
process(setintr);
/*
* Mop-up.
*/
if (intty) {
if (loginsh) {
(void) fprintf(cshout, "logout\n");
(void) close(SHIN);
child = 1;
goodbye();
}
else {
(void) fprintf(cshout, "exit\n");
}
}
rechist();
exitstat();
/* NOTREACHED */
}
void
untty()
{
if (tpgrp > 0) {
(void) setpgid(0, opgrp);
(void) tcsetpgrp(FSHTTY, opgrp);
}
}
void
importpath(cp)
Char *cp;
{
int i = 0;
Char *dp;
Char **pv;
int c;
for (dp = cp; *dp; dp++)
if (*dp == ':')
i++;
/*
* i+2 where i is the number of colons in the path. There are i+1
* directories in the path plus we need room for a zero terminator.
*/
pv = (Char **) xcalloc((size_t) (i + 2), sizeof(Char **));
dp = cp;
i = 0;
if (*dp)
for (;;) {
if ((c = *dp) == ':' || c == 0) {
*dp = 0;
pv[i++] = Strsave(*cp ? cp : STRdot);
if (c) {
cp = dp + 1;
*dp = ':';
}
else
break;
}
dp++;
}
pv[i] = 0;
setq(STRpath, pv, &shvhed);
}
/*
* Source to the file which is the catenation of the argument names.
*/
static int
srccat(cp, dp)
Char *cp, *dp;
{
Char *ep = Strspl(cp, dp);
char *ptr = short2str(ep);
xfree((ptr_t) ep);
return srcfile(ptr, mflag ? 0 : 1, 0);
}
/*
* Source to a file putting the file descriptor in a safe place (> 2).
*/
static int
srcfile(f, onlyown, flag)
char *f;
bool onlyown, flag;
{
int unit;
if ((unit = open(f, O_RDONLY)) == -1)
return 0;
unit = dmove(unit, -1);
(void) ioctl(unit, FIOCLEX, NULL);
srcunit(unit, onlyown, flag);
return 1;
}
/*
* Source to a unit. If onlyown it must be our file or our group or
* we don't chance it. This occurs on ".cshrc"s and the like.
*/
int insource;
static void
srcunit(unit, onlyown, hflg)
int unit;
bool onlyown, hflg;
{
/* We have to push down a lot of state here */
/* All this could go into a structure */
int oSHIN = -1, oldintty = intty, oinsource = insource;
struct whyle *oldwhyl = whyles;
Char *ogointr = gointr, *oarginp = arginp;
Char *oevalp = evalp, **oevalvec = evalvec;
int oonelflg = onelflg;
bool oenterhist = enterhist;
char OHIST = HIST;
bool otell = cantell;
struct Bin saveB;
sigset_t sigset, osigset;
jmp_buf oldexit;
/* The (few) real local variables */
int my_reenter;
if (unit < 0)
return;
if (didfds)
donefds();
if (onlyown) {
struct stat stb;
if (fstat(unit, &stb) < 0) {
(void) close(unit);
return;
}
}
/*
* There is a critical section here while we are pushing down the input
* stream since we have stuff in different structures. If we weren't
* careful an interrupt could corrupt SHIN's Bin structure and kill the
* shell.
*
* We could avoid the critical region by grouping all the stuff in a single
* structure and pointing at it to move it all at once. This is less
* efficient globally on many variable references however.
*/
insource = 1;
getexit(oldexit);
if (setintr) {
sigemptyset(&sigset);
(void) sigaddset(&sigset, SIGINT);
(void) sigprocmask(SIG_BLOCK, &sigset, &osigset);
}
/* Setup the new values of the state stuff saved above */
(void) memcpy(&saveB, &B, sizeof(B));
fbuf = NULL;
fseekp = feobp = fblocks = 0;
oSHIN = SHIN, SHIN = unit, arginp = 0, onelflg = 0;
intty = isatty(SHIN), whyles = 0, gointr = 0;
evalvec = 0;
evalp = 0;
enterhist = hflg;
if (enterhist)
HIST = '\0';
/*
* Now if we are allowing commands to be interrupted, we let ourselves be
* interrupted.
*/
if (setintr)
(void) sigprocmask(SIG_SETMASK, &osigset, NULL);
settell();
if ((my_reenter = setexit()) == 0)
process(0); /* 0 -> blow away on errors */
if (setintr)
(void) sigprocmask(SIG_SETMASK, &osigset, NULL);
if (oSHIN >= 0) {
int i;
/* We made it to the new state... free up its storage */
/* This code could get run twice but xfree doesn't care */
for (i = 0; i < fblocks; i++)
xfree((ptr_t) fbuf[i]);
xfree((ptr_t) fbuf);
/* Reset input arena */
(void) memcpy(&B, &saveB, sizeof(B));
(void) close(SHIN), SHIN = oSHIN;
arginp = oarginp, onelflg = oonelflg;
evalp = oevalp, evalvec = oevalvec;
intty = oldintty, whyles = oldwhyl, gointr = ogointr;
if (enterhist)
HIST = OHIST;
enterhist = oenterhist;
cantell = otell;
}
resexit(oldexit);
/*
* If process reset() (effectively an unwind) then we must also unwind.
*/
if (my_reenter)
stderror(ERR_SILENT);
insource = oinsource;
}
void
rechist()
{
Char buf[BUFSIZE], hbuf[BUFSIZE], *hfile;
int fp, ftmp, oldidfds;
struct varent *shist;
if (!fast) {
/*
* If $savehist is just set, we use the value of $history
* else we use the value in $savehist
*/
if ((shist = adrof(STRsavehist)) != NULL) {
if (shist->vec[0][0] != '\0')
(void) Strcpy(hbuf, shist->vec[0]);
else if ((shist = adrof(STRhistory)) && shist->vec[0][0] != '\0')
(void) Strcpy(hbuf, shist->vec[0]);
else
return;
}
else
return;
if ((hfile = value(STRhistfile)) == STRNULL) {
hfile = Strcpy(buf, value(STRhome));
(void) Strcat(buf, STRsldthist);
}
if ((fp = open(short2str(hfile), O_WRONLY | O_CREAT | O_TRUNC,
0600)) == -1)
return;
oldidfds = didfds;
didfds = 0;
ftmp = SHOUT;
SHOUT = fp;
dumphist[2] = hbuf;
dohist(dumphist, NULL);
SHOUT = ftmp;
(void) close(fp);
didfds = oldidfds;
}
}
void
goodbye()
{
rechist();
if (loginsh) {
(void) signal(SIGQUIT, SIG_IGN);
(void) signal(SIGINT, SIG_IGN);
(void) signal(SIGTERM, SIG_IGN);
setintr = 0; /* No interrupts after "logout" */
if (!(adrof(STRlogout)))
set(STRlogout, STRnormal);
#ifdef _PATH_DOTLOGOUT
(void) srcfile(_PATH_DOTLOGOUT, 0, 0);
#endif
if (adrof(STRhome))
(void) srccat(value(STRhome), STRsldtlogout);
}
exitstat();
/* NOTREACHED */
}
__dead void
exitstat()
{
Char *s;
#ifdef PROF
monitor(0);
#endif
/*
* Note that if STATUS is corrupted (i.e. getn bombs) then error will exit
* directly because we poke child here. Otherwise we might continue
* unwarrantedly (sic).
*/
child = 1;
s = value(STRstatus);
xexit(s ? getn(s) : 0);
/* NOTREACHED */
}
/*
* in the event of a HUP we want to save the history
*/
static void
phup(sig)
int sig;
{
rechist();
/*
* We kill the last foreground process group. It then becomes
* responsible to propagate the SIGHUP to its progeny.
*/
{
struct process *pp, *np;
for (pp = proclist.p_next; pp; pp = pp->p_next) {
np = pp;
/*
* Find if this job is in the foreground. It could be that
* the process leader has exited and the foreground flag
* is cleared for it.
*/
do
/*
* If a process is in the foreground; we try to kill
* it's process group. If we succeed, then the
* whole job is gone. Otherwise we keep going...
* But avoid sending HUP to the shell again.
*/
if ((np->p_flags & PFOREGND) != 0 && np->p_jobid != shpgrp &&
kill(-np->p_jobid, SIGHUP) != -1) {
/* In case the job was suspended... */
(void) kill(-np->p_jobid, SIGCONT);
break;
}
while ((np = np->p_friends) != pp);
}
}
xexit(sig);
/* NOTREACHED */
}
Char *jobargv[2] = {STRjobs, 0};
/*
* Catch an interrupt, e.g. during lexical input.
* If we are an interactive shell, we reset the interrupt catch
* immediately. In any case we drain the shell output,
* and finally go through the normal error mechanism, which
* gets a chance to make the shell go away.
*/
/* ARGSUSED */
void
pintr(notused)
int notused;
{
pintr1(1);
/* NOTREACHED */
}
void
pintr1(wantnl)
bool wantnl;
{
Char **v;
sigset_t sigset, osigset;
sigemptyset(&sigset);
(void) sigprocmask(SIG_BLOCK, &sigset, &osigset);
if (setintr) {
sigset = osigset;
(void) sigdelset(&sigset, SIGINT);
(void) sigprocmask(SIG_SETMASK, &sigset, NULL);
if (pjobs) {
pjobs = 0;
(void) fprintf(cshout, "\n");
dojobs(jobargv, NULL);
stderror(ERR_NAME | ERR_INTR);
}
}
(void) sigdelset(&osigset, SIGCHLD);
(void) sigprocmask(SIG_SETMASK, &osigset, NULL);
(void) fpurge(cshout);
(void) endpwent();
/*
* If we have an active "onintr" then we search for the label. Note that if
* one does "onintr -" then we shan't be interruptible so we needn't worry
* about that here.
*/
if (gointr) {
gotolab(gointr);
timflg = 0;
if ((v = pargv) != NULL)
pargv = 0, blkfree(v);
if ((v = gargv) != NULL)
gargv = 0, blkfree(v);
reset();
}
else if (intty && wantnl) {
(void) fputc('\r', cshout);
(void) fputc('\n', cshout);
}
stderror(ERR_SILENT);
/* NOTREACHED */
}
/*
* Process is the main driving routine for the shell.
* It runs all command processing, except for those within { ... }
* in expressions (which is run by a routine evalav in sh.exp.c which
* is a stripped down process), and `...` evaluation which is run
* also by a subset of this code in sh.glob.c in the routine backeval.
*
* The code here is a little strange because part of it is interruptible
* and hence freeing of structures appears to occur when none is necessary
* if this is ignored.
*
* Note that if catch is not set then we will unwind on any error.
* If an end-of-file occurs, we return.
*/
static struct command *savet = NULL;
void
process(catch)
bool catch;
{
jmp_buf osetexit;
struct command *t = savet;
sigset_t sigset;
savet = NULL;
getexit(osetexit);
for (;;) {
pendjob();
paraml.next = paraml.prev = &paraml;
paraml.word = STRNULL;
(void) setexit();
justpr = enterhist; /* execute if not entering history */
/*
* Interruptible during interactive reads
*/
if (setintr) {
sigemptyset(&sigset);
(void) sigaddset(&sigset, SIGINT);
(void) sigprocmask(SIG_UNBLOCK, &sigset, NULL);
}
/*
* For the sake of reset()
*/
freelex(&paraml);
if (savet)
freesyn(savet), savet = NULL;
if (haderr) {
if (!catch) {
/* unwind */
doneinp = 0;
resexit(osetexit);
savet = t;
reset();
}
haderr = 0;
/*
* Every error is eventually caught here or the shell dies. It is
* at this point that we clean up any left-over open files, by
* closing all but a fixed number of pre-defined files. Thus
* routines don't have to worry about leaving files open due to
* deeper errors... they will get closed here.
*/
closem();
continue;
}
if (doneinp) {
doneinp = 0;
break;
}
if (chkstop)
chkstop--;
if (neednote)
pnote();
if (intty && prompt && evalvec == 0) {
mailchk();
/*
* If we are at the end of the input buffer then we are going to
* read fresh stuff. Otherwise, we are rereading input and don't
* need or want to prompt.
*/
if (aret == F_SEEK && fseekp == feobp)
printprompt();
(void) fflush(cshout);
}
if (seterr) {
xfree((ptr_t) seterr);
seterr = NULL;
}
/*
* Echo not only on VERBOSE, but also with history expansion. If there
* is a lexical error then we forego history echo.
*/
if ((lex(&paraml) && !seterr && intty) || adrof(STRverbose)) {
prlex(csherr, &paraml);
}
/*
* The parser may lose space if interrupted.
*/
if (setintr)
(void) sigprocmask(SIG_BLOCK, &sigset, NULL);
/*
* Save input text on the history list if reading in old history, or it
* is from the terminal at the top level and not in a loop.
*
* PWP: entry of items in the history list while in a while loop is done
* elsewhere...
*/
if (enterhist || (catch && intty && !whyles))
savehist(&paraml);
/*
* Print lexical error messages, except when sourcing history lists.
*/
if (!enterhist && seterr)
stderror(ERR_OLD);
/*
* If had a history command :p modifier then this is as far as we
* should go
*/
if (justpr)
reset();
alias(&paraml);
/*
* Parse the words of the input into a parse tree.
*/
savet = syntax(paraml.next, &paraml, 0);
if (seterr)
stderror(ERR_OLD);
execute(savet, (tpgrp > 0 ? tpgrp : -1), NULL, NULL);
/*
* Made it!
*/
freelex(&paraml);
freesyn((struct command *) savet), savet = NULL;
}
resexit(osetexit);
savet = t;
}
void
/*ARGSUSED*/
dosource(v, t)
Char **v;
struct command *t;
{
Char *f;
bool hflg = 0;
Char buf[BUFSIZE];
v++;
if (*v && eq(*v, STRmh)) {
if (*++v == NULL)
stderror(ERR_NAME | ERR_HFLAG);
hflg++;
}
(void) Strcpy(buf, *v);
f = globone(buf, G_ERROR);
(void) strcpy((char *) buf, short2str(f));
xfree((ptr_t) f);
if (!srcfile((char *) buf, 0, hflg) && !hflg)
stderror(ERR_SYSTEM, (char *) buf, strerror(errno));
}
/*
* Check for mail.
* If we are a login shell, then we don't want to tell
* about any mail file unless its been modified
* after the time we started.
* This prevents us from telling the user things he already
* knows, since the login program insists on saying
* "You have mail."
*/
static void
mailchk()
{
struct varent *v;
Char **vp;
time_t t;
int intvl, cnt;
struct stat stb;
bool new;
v = adrof(STRmail);
if (v == 0)
return;
(void) time(&t);
vp = v->vec;
cnt = blklen(vp);
intvl = (cnt && number(*vp)) ? (--cnt, getn(*vp++)) : MAILINTVL;
if (intvl < 1)
intvl = 1;
if (chktim + intvl > t)
return;
for (; *vp; vp++) {
if (stat(short2str(*vp), &stb) < 0)
continue;
new = stb.st_mtime > time0.tv_sec;
if (stb.st_size == 0 || stb.st_atime > stb.st_mtime ||
(stb.st_atime < chktim && stb.st_mtime < chktim) ||
(loginsh && !new))
continue;
if (cnt == 1)
(void) fprintf(cshout, "You have %smail.\n", new ? "new " : "");
else
(void) fprintf(cshout, "%s in %s.\n", new ? "New mail" : "Mail",
vis_str(*vp));
}
chktim = t;
}
/*
* Extract a home directory from the password file
* The argument points to a buffer where the name of the
* user whose home directory is sought is currently.
* We write the home directory of the user back there.
*/
int
gethdir(home)
Char *home;
{
Char *h;
struct passwd *pw;
/*
* Is it us?
*/
if (*home == '\0') {
if ((h = value(STRhome)) != NULL) {
(void) Strcpy(home, h);
return 0;
}
else
return 1;
}
if ((pw = getpwnam(short2str(home))) != NULL) {
(void) Strcpy(home, str2short(pw->pw_dir));
return 0;
}
else
return 1;
}
/*
* When didfds is set, we do I/O from 0, 1, 2 otherwise from 15, 16, 17
* We also check if the shell has already changed the decriptor to point to
* 0, 1, 2 when didfds is set.
*/
#define DESC(a) (*((int *) (a)) - (didfds && *((int *) a) >= FSHIN ? FSHIN : 0))
static int
readf(oreo, buf, siz)
void *oreo;
char *buf;
int siz;
{
return read(DESC(oreo), buf, siz);
}
static int
writef(oreo, buf, siz)
void *oreo;
const char *buf;
int siz;
{
return write(DESC(oreo), buf, siz);
}
static fpos_t
seekf(oreo, off, whence)
void *oreo;
fpos_t off;
int whence;
{
return lseek(DESC(oreo), off, whence);
}
static int
closef(oreo)
void *oreo;
{
return close(DESC(oreo));
}
/*
* Print the visible version of a string.
*/
int
vis_fputc(ch, fp)
int ch;
FILE *fp;
{
char uenc[5]; /* 4 + NULL */
if (ch & QUOTE)
return fputc(ch & TRIM, fp);
/*
* XXX: When we are in AsciiOnly we want all characters >= 0200 to
* be encoded, but currently there is no way in vis to do that.
*/
(void) vis(uenc, ch & TRIM, VIS_NOSLASH, 0);
return fputs(uenc, fp);
}
/*
* Move the initial descriptors to their eventual
* resting places, closin all other units.
*/
void
initdesc()
{
didfds = 0; /* 0, 1, 2 aren't set up */
(void) ioctl(SHIN = dcopy(0, FSHIN), FIOCLEX, NULL);
(void) ioctl(SHOUT = dcopy(1, FSHOUT), FIOCLEX, NULL);
(void) ioctl(SHERR = dcopy(2, FSHERR), FIOCLEX, NULL);
(void) ioctl(OLDSTD = dcopy(SHIN, FOLDSTD), FIOCLEX, NULL);
closem();
}
__dead void
#ifdef PROF
done(i)
#else
xexit(i)
#endif
int i;
{
untty();
_exit(i);
/* NOTREACHED */
}
#ifndef _PATH_DEFPATH
static Char **
defaultpath()
{
char *ptr;
Char **blk, **blkp;
struct stat stb;
blkp = blk = (Char **) xmalloc((size_t) sizeof(Char *) * 10);
#define DIRAPPEND(a) \
if (stat(ptr = a, &stb) == 0 && S_ISDIR(stb.st_mode)) \
*blkp++ = SAVE(ptr)
DIRAPPEND(_PATH_BIN);
DIRAPPEND(_PATH_USRBIN);
#undef DIRAPPEND
#if 0
if (euid != 0 && uid != 0)
*blkp++ = Strsave(STRdot);
#endif
*blkp = NULL;
return (blk);
}
#endif /* _PATH_DEFPATH */
void
printprompt()
{
Char *cp;
if (!whyles) {
for (cp = value(STRprompt); *cp; cp++)
if (*cp == HIST)
(void) fprintf(cshout, "%d", eventno + 1);
else {
if (*cp == '\\' && cp[1] == HIST)
cp++;
(void) vis_fputc(*cp | QUOTE, cshout);
}
}
else
/*
* Prompt for forward reading loop body content.
*/
(void) fprintf(cshout, "? ");
(void) fflush(cshout);
}
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